Television antenna



M y 1951 s. GALPER' 2,551,664

TELEVISION ANTENNA Filed Nov. 29, 1949 INVENTOR. SAMUEL GALPER 7 VATTORNEY Patentecl May 8, 1951 UNITED STATES PATENT OFFICE 3 Claims.

This invention relates to television antennas, particularly tonon-directional antennas of the folded type for indoor or inbuilt use.

It is primarily within my contemplation to provide an antennaconstruction wherein the half- Wave folded dipole elements are ofcircular configuration, there being two concentric elements for high andlow bands of the television spectrum, the assembly being so constructedas to be simple to fabricate, easy to handle, convenient to ship andstore, and sufiiciently rigid to maintain the component elements inpredetermined relative disposition.

Attempts have been made to employ wire elements as the antennacomponents of a dipole construction, by mounting said wires on a.cardboard backing which had previously been slit to provide flaps underwhich the wire components were manually slipped for frictionalattachment to the backing. It has been found that this type ofconstruction was costly, and in order to maintain a proper spacedrelation between the high and low frequency elements, considerablecaution and skill were required, therefore adding considerably to thelabor costs. It is one of the important objects of my invention toprovide a dipole construction having none of the aforesaid high laborcost factors, and which will nevertheless have the advantages of anefficient and convenient antenna construction.

It is a further object of my invention to provide an antenna device ofthe aforesaid class capable of mass production manufacture by means ofconventional die cutting and laminating methods.

Still another object of my invention is to provide a construction whichwill comprise several complete antennas from a, single die-cut unit,whereby said several antennas may readily be separated from the unitprior to installation. And in this aspect of my invention it is animportant object to provide a die-cut multiple antenna, constructionincluding electrically joined high and low frequency folded dipolecomponents, and another folded dipole element adapted for FM modulationfrequencies between the said high and low television bands.

Other objects, features and advantages will appear from the drawings andthe description hereinafter given.

Referring to the drawings,

Figure l is a, plan view of a multiple antenna unit die-cut from a sheetshown by dot-dash lines, in accordance with a preferred form of myinvention.

Figure 2 is an enlarged fragmentary section of Figure 1 taken along line2--2.

Figure 3 is a folded dipole antenna, for high and low frequency bands,formed from the unit of Figure 1, and showing transmission lineconnections to the low frequency element.

Figure 4 is an enlarged section of Figure 3 take substantially alongline 44.

Figure 5'is a perspective rear view of an open television cabinet withthe antenna of Figure 3 operatively in place.

Figure 6 is a plan view of another form of antenna unit comprising threeseparable antennas, and

Figure '7 is a perspective disassembled View of the three antennasformed from the structure of Figure 6.

In the various forms of my invention illus trated, I employ a backing ofrelatively stiff material, such as cardboard, upon which is adhesivelyapplied a sheet 01 metal foil. such as aluminum. Thereafter, accordingto the method of my invention, antenna units are stamped out of thesheet, preferably by die-cutting methods, leaving scoring lines toenable the separation of two or more antennas from each unit.

By referring to Figure 1 it will be seen that the main sheet [5 is of alaminated construction, comprising an insulating backing and a metallicfoil on one surface thereof. By die-cutting or other suitable means, theantenna unit I I is blanked out to form two separable antennas, to wit,the antenna comprising the two folded circular dipoles l2 and i3, andthe flat multiband antenna 14. Unit ii comprises the backing I5 ofcardboard or other relatively stiff material, and the metal foil l6(Figure 2) According to the structures of Figures 1 and 2, the flatantenna I4 is separated from the circular concentric elements !2 and Isby thecircular cuts or scoring circles H and 18, the said scoringsextending only partially through the backing 55 so that members l2, l3and I i are held together as a unit, but which are nevertheless capableof ready separation along said scoring circles.

The circular elements l2 and i3 are proportioned to serve as half-wavefolded dipoles, element !2 being for low frequency bands and element !3for high frequency bands. Said elements :2 and I3 are maintained inproper spaced relation, when in the form shown in Figure 1, by themember l4 and the two connecting members l9 and 2&3. As will be observedfrom the drawings, the elements i2 and I3 are almost complete circles,the outer ends 24 and 22 of element I2, and the outer end 23 and 24 ofelement l3 being spaced from each other, respectively, the said ends 2Iand 23 being electrically joined by connecting element I9, and thesaidends 22 and 24 being electrically joined by connecting element 20. Thesaid ends 2I and 22 of the outer element I2 contain the apertures 25 and2-6 respectively; and the outer terminal portions of the intermediateantenna member I4 contains the apertures 21 and 28. These apertures areadapted to receive transmission line lugs substantially of the kindshown in Figure 4.

The unit I I of Figure l is, as aforesaid, adapted w Or, if it isdesired, the intermediate flat tele--.

vision antenna I4 may be pressed out from the unit iIl'kl'lOWl'l manner.

Figures 3 and 4 show an antenna formed from the :unit-I I, theintermediate antenna I4 having been-removed. It will be observed that ineach of said holes 25 and 25 (25 in Figure 4) is an eyelet 29 theopposite heads of which are in engagement-with a washer 38 and the lug3|, respectively, the latter being electrically connected to thetransmission line 32. Since said lug is in engagement with the metalfoil I5, it is obvious that the transmission line 32 is electricallyconnected to both elements I2 and I3.

The antenna, of Figure 3 can be employed indoors, either on the floor,under a carpetor it may be used as an inbuilt antenna like that shown inFigure-5. ,The television cabinet 33 contains, attached to the undersideof roof 34, the antenna of Figure 3, the flat circular elements 52 andI3 being attached by fasteners 35 to said roof 34. The transmissionlines 3-2 are electrically connected, in a manner well-known in the art,to the tuner or to an added pickup.

It is thus apparent that by a simple stamping or die-cutting operation,applied to a laminated sheet including a backing and a metal foil, aconvenient, easily handled and eficient high-andlow frequency bandantenna, of the folded dipole type; is provided. Not only could thedevice be easily shipped, but it is readily applied in the mannerindicated. Furthermore, it is readily fabricated without the use ofdimcult labor operations, such as would be necessary if circular wireswere to be attached manually to a supporting backing- It should furtherbe noted that the antenna member, pressed out from unit II, may servethe purpose of an FM antenna. In many localities the FMfrequencies lieapproximately between the high and low frequency television bands; andin such locales member I4 will adequately serve as an FM antenna.Although such an antenna would not have specific definition betweenbands, it nevertheless could serve, in certain inexpensive receivers, asa satisfactory multiband antenna.

The unit 36 shown in Figure 6 is substantially like.unit I I of Figure1, except that it is slightly differently proportioned and scored so asto enable three antennas to be formed therefrom.

The'dot-dash circles 37 and 38, joined by the" connecting lines 39 and40 represent the critical proportions of a circular dipole constructionfor the high and low bands of the television spectrum. Circle 37 isintermediate circles 4| and 42; i and circle 38 is intermediate circles43 and 44. Similarly, line 39 is intermediate connecting lines 45 and46; and line 40 is intermediate connecting lines 4'! and 48. When unit36 is die-cut along the said circles and lines, and the componentspressed out as shown in Figure '7, three separate antennas are produced,these being antennas 49, 50, and 5|. Antenna 49 contains dipole elements52 and 53, these being defined by the edges 4|, 37, 38 and 44 (Figure 6)elements 52 and 53 being joined by the connecting elements 54 and 55.Antenna contains the circular elements 55 and 51, these being defined bythe edges 31, 42, 43 and 38, the elements 55 and 51 being joined by theconnecting elements 58 and 59. Antenna 5| is the fiat multiband type,substantially like antenna i4, above-mentioned, and is definedby theedges 42 and 43. Although in this construction the mean diameters of theantenna elements of antennas E9 and 59 are not equal to the criticaldiameters 31 and 38, they are neverthelessadapted to receivesatisfactory signals for the high and low bands, for all practicalpurposes. And the antenna 5! is similarly suitable for FM bands betweenthe high and low television bands.

It Will be observed that in the unit of Figure 6, the outerv portionthereof defined by circles 4|, 3'! and 42 embodies in contiguousrelation the elements 52 and 55, and the elements 53 and 51,respectively, shown in Figure '7. The antenna 49 is larger than andembraces the antenna 50; and the antenna 5i is disposed, on the sheet ofFigure 6, intermediate the positions of the two arcuate elements 56 and51 shown on Figure '7.

In both forms of the invention illustrated, the intermediate antennas I4and 51 are wider than the circular elements I2 and I3, and the elementsof antennas 49 and 59, respectively, The width of the backings of thevarious antennas shown are the same as of the foil sheets to which theyare attached, rendering the antennas readily adaptable to be formed fromflat laminated sheets by conventional die-cutting methods.

In the above description, the invention has been disclosed merely by Wayof example and in preferred manner; but obviously many variations andmodifications may be made therein which will still be comprised withinits spirit. It is to be understood, therefore, that the invention is notlimited to any specific form or manner of practicing same, except in sofor as such limitations are specified in the appended claims.

I claim:

1. A laminated sheet unit for forming a plurality of televisionantennas, said sheet unit comprising a fiat sheet of metal foil and aninsulating backing therefor, the foil and backing combination beingscored to produce a plurality of separable parts, one of said partsbeing of the configuration of an antenna comprising two looped elementsin spaced relation with two spaced connector members joining saidelements, another of said parts comprising the portion intermediate thesaid two looped elements and being defined by said elements and the saidconnecting members, said latter part being of the configuration of alooped antenna and being wider than the looped elements of saidfirst-mentioned antenna, whereby it is adapted for frequencies betweenthose of the two said first-mentioned elements.

2. A laminated sheet unit for formin a plurality of television antennas,said sheet unit comprising a fiat sheet of metal foil and an insulatingbacking therefor, the foil and backing combination being scored toproduce a plurality of separable parts, one of said parts being of theconfiguration of an antenna comprising two looped elements in spacedconcentric relation, the ends of each of said 100ped elements being inadjacent spaced relation, whereby said elements are almost completeloops, said looped foil elements being electrically connected by twospaced connecting members of metal foil extending from the ends of oneof said elements to the corresponding ends of the other element, wherebysaid elements and members form a continuous electrically connectedconductor comprising an inner high frequency antenna element andelectrically connected thereto an outer low frequency antenna element;another of said parts being of th configuration of a looped antenna andbeing wider than the looped elements of said first-mentioned antenna,whereby it is adapted for frequencies between those of the two saidfirst-mentioned elements.

3. A laminated sheet unit for forming a plurality of televisionantennas, said sheet unit comprising a flat sheet of metal foil and aninsulatlng backing therefor, the foil and backing combination beingscored to produce three separable parts, two of said parts being each ofthe configuration of an antenna comprising two looped elements in spacedrelation with two spaced connector members joining said elements, saidelements and members being in contiguous relation, whereby one of theantennas embraces and is larger than the other; the third of said partscomprising the portion of said sheet disposed between the two loopedelements of the smaller of said two first-mentioned antennas and beingdefined thereby and by the connecting members; said third part being ofthe configuration of a looped antenna and being wider than the loopedelements of said first-mentioned antennas, whereby it is adapted forfrequencies between those of the two first-mentioned antennas.

SAMUEL GALPER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,479,337 Fyler Aug. 16, 1949FOREIGN PATENTS Number Country Date 474,438 Germany Dec. 20, 1927451,213 Great Britain July 31, 1936

